Process of applying a coating of one metal to the surface of another metal.



No. 871,685. PATENTED NOV. 19, 1907. A. FREIER.

PROCESS OF APPLYING A COATING OF ONE METAL TO THE SURFACE OF ANOTHER METAL.

APPLICATION FILED MAY 13. 1907.

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a UNITED STATES PATENT. OFFICE.

ANTON Fenian,- or BOSTON, MassAcHiisETTs, as sIeNoR To HoLrzER OABOT ELECTRIC CQMPANY, A CORPORATION OF MASSACHUSETTS.

PROCESS OF APPLYING A COATING OF ONE METAL TO THE SURFACE OF ANOTEELR METAL. I i

To all whom it may concern:

Be it known that I, ANTON FREIER, a citizen of theUnited States,-residing in Boston, in the countyofSuffolk and State of Massachusetts, have invented an Improvement in Processes of Applying a Coating of One platinum, while it is desirable to use the minlmum amount of'that material on account of the cost. It is obvious, however, that the same process may be apipliedfor analogous processes, wherever it is esiredto apply a thin coating of one material to a port1on of the surface of a member composed in the main of different material.

In carrying out the process, the metal which is to be used for the coating is applied in the form ofa thin sheet to the surface of a Similar sheet of other metal, the two being joined together in any suitable way, as by brazing; The second sheet of metal'is utilized as a support for the coating'sheet, and

may possess different ualities; being, for example, harder or toug er, and in most instances less costly. In making platinum. tips, for example, the latinum coating may be applied to aisheet 0 German silver which is're atively inexpensive and possessed of the necessary strength to afford a backin the sheet of German silver being of any thic n'ess which may be desired.

The article to which the metallic coating isto be applied, such, for example, as a metalhc electric contact spring, is rovided with an opening or recess, and" t e compound strip consisting of the two sheets of metal joined together, as above described, is placed dver the opening and a piece is punched out,

and, by the, same operation, forced into the 1 opening with a tight driving fit, so as to be frictionally held therein with the coated strip'projecting slightly beyond the surface.

Figure 1 is a sectional view of a compound strip made up in accordance with the first Specification of Letters Patent. Application filed May 13. 1907- Serial No. 373.209.

Patented Nov. 19, 1907'.

step of the process; Fig. 2 is a sectional view of the compound strip and the article to which the coating is applied, the same view' showing the punch which has been operated to apply the coating; and Fig. 3 is a view similar to Fig. 2, showing a coating applied to an article differing in shape from that shown in Fig. 2.

In-describing the invention, the process of applying a platinum tip portion to an electrical contact spring or other member will be specifically referred to, for convenience, with the understanding that the process isnot in any way limited to any s ecific article of manufacture. With thisun erstanding,'what may be termed the compound strip illustrated in Fig. 1 may be described as consisting of a thin sheet of platinum a brazed, or

other'wise'joined, to the surface of a similar sheet of German silver I), the latter sheet bemg of sufiicient thickness to afford the strength and size needed in frictionally supporting the platinum coating in the contact The compound strip shown in j s ring 0.

ig. 1 is then placed in the position shown in Fig. 2, with relation to the contact spring 0 to which the tip is to be applied, the said. strip 0 having been previously provided with a hole or opening 0 to receive and retain a portion of the com ound strip a, r

In the construct1on illustrated in Flg, 2 1n which the platinum tip consists of a protuberance from the surface of the contact spring c, the platinum surface is placed in contact with the surface of the s ring 0, and the unch d, in alinement wit the opening 0 is then 0 erated to punch out a piece of the strip an force the same into and part-way through the opening 0 so that the platinum surface projects just beyond the under surface of the spring 0.

While-the spring 0 1s shown as supported upon a die e, the opening e in the dice does not operate as part of the cutting portion of the punch, the openingv c in the contact spring 0 itself constituting the outer cutting In this way, the iece which is cut instead of being merely held in place by I herence to the 'material I).

The platinum I tip, therefore; can be subjected to heat up to the melting point of the platinum Without becoming disengaged from the spring 0, un-

less the spring itself is. melted so as to disensurface of a s ring, a: piece of thestrip is opening.

punched and orced into an'opening at the end of the pin, as indicated in Fig. 3, Where the pin 0 is provided at the end with a platinum point. I-n this case, the pin 0 is provided With an opening 0 the process being the same except that the German silver portion I) is laced adjacent to the opening, and a piece oi the compound strip forced only far enough'into the opening to cause a small art of the platinum to be held'by the Walls of the Claim.

The herein described process of applying a coating of one metal to the surface of an- I other metal Which'consists in causing a sheet of the coated metal to adhere to a sheet of different metal and punching a iece out of the compound sheet thus forme and at the same operation forcing the punched out piece into an opening formed in the piece of metal tofbe coated, substantially as described.

p In testimony whereof, I have signed my name to this specification in the presence of ANTON FREIER.

Witnesses:

HENRY J. LIVERMORE, JAMES J MALoNEY. 

